The following graph shows changes in marine life populations in several years in a body of salt water. Report the main features and make comparisons where relevant. Write at least 150 words.

The bar graph depicts the variation of seal, whale, and dolphin populations from 2006 to 2018, with 4-year intervals, in the Georgia Strait. As reflected by the y-axis, population is measured from 0 to 60, with intervals of 10. At first glance, it is clear that the dolphin population grew significantly from one time interval […]